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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '240e6dcdb37c491771cfe91db1dc3d53cfc36ab894b27acd45f796c43921c23b' 
  AND token = '0etfgvuOPxu+8Q0bwdg5vymF9OEVlIAg+jqDSMOFFMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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