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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b914cb23b0bf3eff38ac73cba921762acc7ef67b064aa7dbd8d38192820da790' 
  AND token = '94fPrrfkWWFP+jxBT4U7kYn3cIZY8guNywkbvvYIn7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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