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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6ffb258f6096083841e3904dbef97323c0d23cbc17f1eba8e7c5dbceff1c12c' 
  AND token = 'KSLqxO/O6OjrD2YSNEKjZe2M1giWnodc+wysgT3pUaQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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