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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc6f23f7e650bcb72eee139328df9ecd318dcb2eba5c77be4c426857f73a7693' 
  AND token = 'iQnsNw5q4gU8joeEAl4v//3heJxieBJjsadz4alnu/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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