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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '160fe3b02f5044b5bb390dad1b19b09ecb93a5866faa2676239d1ef2208d0943' 
  AND token = 'wA6Y3m/vBqAzk8AB7lqao6epF5vQhg6bfi+lTkokBZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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