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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71dc2c592d9963722e188aa806e68af035dc699f120c52f49d93343a96b2ab72' 
  AND token = 'LVFuHVxV40mb3fONTHy8iLibjUxfXToq540a/Q9Kwzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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