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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2340327c758f580bc2a5e8d54d620d7d5cdc1124c7e2db808902f7bb1c079a94' 
  AND token = 'KMsYx0jFDZceZ8xIqbf0rOgoUN3gnb+Hpy9odBBnAZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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