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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91ecb3fdfb6585bcdc882829fd3a5d1e8232bd5eeaaf016428dd516293b9a45d' 
  AND token = 'jmEfyg1iOSV9rq5/PN61gG03oPUVtDTgsLs5b3mAVD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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