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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f3ec4b714079d641a05e194d1cda6e4a21146e990f4fa3941be4682b08530f5' 
  AND token = 't8YJMpX2spa2on0/hypVkK10qy9afhB1eyMWi7nCD1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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