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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99ac9d5680986ac9009a0e31e2ce8e4e7351c4499bef9e63b5017cba6e9b1873' 
  AND token = 'ZQHGZg6cgkOZKNgLX2aMb6x6WFng2o7oU1iRs6ulAeA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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