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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19d31dd0942db911e3aeeb1089a4727b80b6548af7b27d1291d3edfbf39a7fc0' 
  AND token = 'do8LYYhxlf8pYtA3tP3xtsKSKyMLtMKJ6P6duIM6Yco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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