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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '058121ec15428e5929a56e22ab2c4fc87394832b8948152230cd619d8b0b3090' 
  AND token = 'RqaijgoM6IRHyEr2nJgZB1Som9vCCkmNCiC1uwLhAX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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