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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8b0e81a01fb0504a97238e0d5c68f259a89564892a76bc0221978f6426c26a9' 
  AND token = 'r+tgJD0C4hNlGi3fuI9OmOiB/Joak6JVyz2ps0l1w8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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