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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c1c415a9e9d2017d4139b40b2ad6bd6c5bd2d483bb3d01ac175798ec0b960f6' 
  AND token = 'FM423Y7r0Mq6AGyAuOBrXMWEuwX5rLjcFmSxgCoaL8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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