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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec57066d23ef3884030a7265ac287522c67e1ccb712a8d6eb4e9105fa492d5e8' 
  AND token = '22KkypF3cv5S8gR/Cq19Y0DCR1LsRVuxF0fzLecfgJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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