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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b67fcf321bdd0ba93e54efba56daa9861d977c32f15f08cf5395e051570491cd' 
  AND token = 'rcUX3VtxMVmxYI6QftalgMRnJIHz4Sq00HYnIt/7lhE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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