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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c0885ba512ab79b303429dd529becbb86b610ec4f7a90729c5b7600c97310fe' 
  AND token = 'NOBKg8RWk4wEXI/mUBeC4dViVkcKwHeklcL688NCM8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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