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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40f40dc07064f043630aac8b6a4d7c2114a17484ef249b35aabacb967232fb73' 
  AND token = 'F6I6lREEYhiEVjWD7ss7DfVbH6U9wPQi9BegagXNS1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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