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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39209ea807183d92a851a1b3bd991bd13be379e585f359e8be46e34946ae5b31' 
  AND token = 'r5Nfsqleil0AZG6OEn28i8V1LM8Jx88YWLP47rX3kz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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