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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '462963e4fa0401fc3bd634f3d8a0f5d78203df561ed3c0d0c9759be3e9dd4b83' 
  AND token = 'B1gb14mGJiorWhPIbk9nNZoJQOOqwPiu/a2nv74sMbg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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