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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f74c7a34f110953299dd3a0c83288bd6a0186d5c24394249e095a43fcd09c34a' 
  AND token = 'ja8GS0mLn7oGg1L/phvHszV0AicEDdzfAFbxjT4yiYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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