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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '777967cf76caa0c74e7618d205340dd3fc3c1021c22e02dd085d3cad6a4f9741' 
  AND token = 'o0E0W0Vk3jMtal51Bcgu+gAmcCo4hwQNyz+7um9Okbs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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