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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5beb30d9f2c4c32fa799352306ce73eed556ffb0f8b019361c6c416dccf57e5b' 
  AND token = 'ilhXCyfZ61DE/f14ODLIvVhTwKm1p6MQXcyfGmh8mEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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