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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbff06830cc2dd639bdc4f1c861ebfc68edd67f5a16c0f57bd42f673040e63b1' 
  AND token = 'SOqc+Bt5+Rt/orFJ+W499Ax9vl1KlgcW2fTE8TPMHgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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