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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '817ed8c07f6cd7b5fe24c0e69c8ce2ad6ce007fee2bc34d1545c532a2388b373' 
  AND token = 'ql6LG1ftfSC2YF6D5kGKIeCG1jX5DpeU6Y2Yha4hn4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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