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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5be9b4f12615a8145da776ac170af03edafbb7cf946e12c2d908c898b130d97c' 
  AND token = 'TjoYdrIrjOIw0Prgf/eay1o7Nkq8bncfDVUkGAuL2X4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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