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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '789a3cb2dbecaeb9f5dca16ad24ce17ac87565d5dfb0009c4776847107afd551' 
  AND token = 'w79jmzGiGCqM3lCH3b0/Pa2oeRQI03eviKUYH0cD9I0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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