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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba34ecf43eaba1e0ea12b0fcaa26be73022f0fd0688fd3de57fae00fe3fa86bd' 
  AND token = 'roE1bQpbAqUbL/Drm8qF2egovC6fR3B24UODfDTf6uA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00090

JSON explain

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