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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3a03406a037d2a98af7dab34d3861cd69ef09cd00ff58e805685fba4d4a0c5d' 
  AND token = '6l8QiaxivdNOO2KqD6rIdqv4Oj1wNgryep+2vcRe7Fs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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