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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a48ae16a2567efc69e2bdd98f132b35c324eefba5a71983eb989b1df659fdbd1' 
  AND token = 'uinENXfR3NCf64HBvgYXYupO5k8Qfdv5HR3RrISfosw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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