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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cb57c66d64dc70d7d3182536fe6659ab357bca1f6b2895085147552f78cb443' 
  AND token = '3X1O68+Yd/ffExjriGZRWdC+PCN03HBj7c2q1zkS1ms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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