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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c15633d63fc9ad5cc5309ed54eb62e97f6feabc9579fa62c6de6a54bd5fc79dc' 
  AND token = 'ZHEnVBmHT4LgwMkj6d7OHgVh/vPd6duECd4c+ukuCbg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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