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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cf883e554cad3e00d3789e50bd21d6acedb128e1546088c26e678f9a576fb6c' 
  AND token = 'XXQowko4nq9d2mjf6X8SdSLThY7cS82f5hfORW4+sks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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