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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5618f94fa376a0e7f436873daf013c7f34f35129b063c4f850abb980c832ec7e' 
  AND token = 'GDxdBHJEJd38E1qwuhnKObtJNGMRiO+Twi0e07Oq12c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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