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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56a85d00149a0b775936d7bfd04379615b0f6f24cba74da49e990e76c3475cdb' 
  AND token = 'KHlrw/PPrBZltsnLH/LYRcgh7dotTVhlmpk56WbiBPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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