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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ffd431c8e7acd4ce64402d7db090c2260992006f4b0724130f48d474b669b5c' 
  AND token = '1AuKFof4Us0i1wMT8nR+cWQzCJyqQFtcD1lMmNqXadY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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