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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd8b9b2a393f2766fb69695b3f744a838cf10fec871d6f73a5cf45afd656bb26' 
  AND token = '7AFxt0+iiWoDjA9vDikW4n5dUNG/xxH+LbtpbB4fDgc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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