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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '088ee847d82ed77009838471ee7af2db9685065d6c70e4355d142cc47ca87109' 
  AND token = 'rBMbv5LoLqfs7hbCu4evhjy4zTgxvlPHFOFy9ThhCVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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