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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb86f1c689261b1821c18ced09c6d561c12eb2ee25b9ccf826ce9247eb1ee738' 
  AND token = 'X9UvscN1lrzbn6euyhv6JwGnP9WcGgNBUtHUWGxlzzQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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