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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6dcfedf343d3db25dc32e30a4c4fea2296fea3bb4b23e0cd51939b8577d011eb' 
  AND token = '5FWzG0hbXrjOFWeSDHAt0wvdmDa11ysYlSyosAMBh8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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