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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e26caa83fe3f78bf5d82045b55fa4d19a67b812f4725fe7a5cdf15ad68ced7a2' 
  AND token = 'IMED+b1fQW+boeH55kxOMAFG7qVrhzB50Ae7OMNv3ik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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