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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '086d316a2f3e71ab12b7b64018421873cd7d4321ce2f78f34c977061b1187f80' 
  AND token = 'Y2WKbENtjbN4sEpjV45tKtBe0YwXwvI+OTiqNPd32e4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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