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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd12a03acc3d89caf9e2eb6ec8743ca622ef20be86f0be41993a68a8b0e30efe' 
  AND token = 'BL6w5+3C7+zPyO6900OYN82xzuoa6Nb0BaOHmRUF/cc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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