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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db997f07e7b8ccc973e7d8453aa206411c1953dc58c4eb422d15b325310a3629' 
  AND token = 'TZBcj5fGM8em6L/t4k3VQJ5TKMrjfJWWOhA2416ZVm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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