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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30c9ed40d0484cf50cb038592ac3500dc0de4ab613c9473ff245304c27fa638d' 
  AND token = 'T0OSV//40Al6704BQX4cPcRycUG8thtEIGWSlH6UAmk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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