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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdda47335ac4e641cec4f05441afc7a09d0ad7c9b76c672a0603d691961c863b' 
  AND token = 'xX4aqavvpA7GdiuoMp1boQKFvDe7BtEMiPL4sbzKr7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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