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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3184118727793e76c98bbd77f059cacf77b0e1d9833e4277ea30993efd76cf03' 
  AND token = 'XdsHRFkrNvIG5jsONfhaWrT9D8S5u7DWtBsx/PpXSQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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