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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cc50ec177eb50f383c1ff3521ae84ed1b174fcb98cad99616b9af6ec98de0c2' 
  AND token = 'z7cSO+GJD6NR6sU3+UwJUE5mn9bhG3acBTOAc80Cu9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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