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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b14110b4d8deb702f3e8f662f8414b265ce03d42a2741bd9ee6cb58c390a0d2' 
  AND token = 'vSF97+VCF+Abdl3duYqGaXzV78yF2Z60uVXLZOSlbyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}