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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '017448f000ed996fba6ba27b078f649c7d3a17884e38e94794ae9864eaf6c214' 
  AND token = 'A2d1B+sAa4HPGk54F3SNVk6vmzIKrxpk/adBfcxlktE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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