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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aea7cce55e73b3370aad80d0fe939389d7954d83ec346dede4d393dd1459e3f2' 
  AND token = 'fa9lnMXBsSpIjOuHDCtiw88ru0GdHWJXZV6nyyXtEdM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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