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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77d471ae07a4468c0c21e3b734ac5f389543291b4af51fd43e660ce81f7b1198' 
  AND token = 's3p1morTDiomQnkjYxXzLkUQKrUQkVLXjyzv6JdydEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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