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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc3150e49ebb2729422d593b98f3ea01cef6d4f1d5d5db62de847ca3472216df' 
  AND token = '6emP1LJxxFNLtD9WV9LZnMXknvjkXpiL/6pn+ahcYRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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