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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16b3ae178c00a940304dc929d7d8f7933394179506bf977448be8eba11c20f15' 
  AND token = 'h3UeX456cERh3MChxqstw0relKBAZVbby1jhyQUrpyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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