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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3e7dac6e168432441436782288f3dd296d7c6e9b406f0ebfc3326a3e1bc7078' 
  AND token = '9kS+/gv1V2BBMeG9SwqmEMs776vgVq4m6gGkzgJKlTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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