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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5672647ffbcfaefefb67206459bb0a2a317e7bd879241460df1fb5d3d6f73fce' 
  AND token = 'yNrtU8DnRcWrm3+No8ucNYrCaSfwx3UPIPLW52NsiyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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