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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0079e1a94734c90c62c94c24631141c8479e52070e946b3ca96c937872c32768' 
  AND token = 'HIFvKA3q26pw6pcOfEVRrX8c1cFq2v4JyQWX0OTA3vU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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