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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ea0ea3c7bf80b8a18feb403fb2fffec5340dcea793cdab78529b3be7f6cca20' 
  AND token = 'ndmr63qMZFhVDhr/e4PZYjEMr0vim392AyL4j9v3HEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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