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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3843cc91b87436f1d2f8a4c3dc657225ae2a3064a01305f74ea0fcd6c770e56d' 
  AND token = 'Hgq+SOiqjSNjOa20mSOEWk7aHlN0/oLoBUO9iK4ncpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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