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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '173c47b104d8eae45dc74e48440c4411e6b57be8c00807aac8e8e6282a555556' 
  AND token = '4G3Fr1/KnBchL1bVzlmZ3Iv1rWodhTKe8VjX1whc+DE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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